bridge: mrp: Implement netlink interface to configure MRP

Implement netlink interface to configure MRP. The implementation
will do sanity checks over the attributes and then eventually call the MRP
interface.
Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/bridge/br_mrp_netlink.c

@@ -6,6 +6,97 @@
 #include "br_private.h"
 #include "br_private_mrp.h"
 
+static const struct nla_policy br_mrp_policy[IFLA_BRIDGE_MRP_MAX + 1] = {
+	[IFLA_BRIDGE_MRP_UNSPEC]	= { .type = NLA_REJECT },
+	[IFLA_BRIDGE_MRP_INSTANCE]	= { .type = NLA_EXACT_LEN,
+				    .len = sizeof(struct br_mrp_instance)},
+	[IFLA_BRIDGE_MRP_PORT_STATE]	= { .type = NLA_U32 },
+	[IFLA_BRIDGE_MRP_PORT_ROLE]	= { .type = NLA_EXACT_LEN,
+				    .len = sizeof(struct br_mrp_port_role)},
+	[IFLA_BRIDGE_MRP_RING_STATE]	= { .type = NLA_EXACT_LEN,
+				    .len = sizeof(struct br_mrp_ring_state)},
+	[IFLA_BRIDGE_MRP_RING_ROLE]	= { .type = NLA_EXACT_LEN,
+				    .len = sizeof(struct br_mrp_ring_role)},
+	[IFLA_BRIDGE_MRP_START_TEST]	= { .type = NLA_EXACT_LEN,
+				    .len = sizeof(struct br_mrp_start_test)},
+};
+
+int br_mrp_parse(struct net_bridge *br, struct net_bridge_port *p,
+		 struct nlattr *attr, int cmd, struct netlink_ext_ack *extack)
+{
+	struct nlattr *tb[IFLA_BRIDGE_MRP_MAX + 1];
+	int err;
+
+	if (br->stp_enabled != BR_NO_STP) {
+		NL_SET_ERR_MSG_MOD(extack, "MRP can't be enabled if STP is already enabled\n");
+		return -EINVAL;
+	}
+
+	err = nla_parse_nested(tb, IFLA_BRIDGE_MRP_MAX, attr,
+			       br_mrp_policy, extack);
+	if (err)
+		return err;
+
+	if (tb[IFLA_BRIDGE_MRP_INSTANCE]) {
+		struct br_mrp_instance *instance =
+			nla_data(tb[IFLA_BRIDGE_MRP_INSTANCE]);
+
+		if (cmd == RTM_SETLINK)
+			err = br_mrp_add(br, instance);
+		else
+			err = br_mrp_del(br, instance);
+		if (err)
+			return err;
+	}
+
+	if (tb[IFLA_BRIDGE_MRP_PORT_STATE]) {
+		enum br_mrp_port_state_type state =
+			nla_get_u32(tb[IFLA_BRIDGE_MRP_PORT_STATE]);
+
+		err = br_mrp_set_port_state(p, state);
+		if (err)
+			return err;
+	}
+
+	if (tb[IFLA_BRIDGE_MRP_PORT_ROLE]) {
+		struct br_mrp_port_role *role =
+			nla_data(tb[IFLA_BRIDGE_MRP_PORT_ROLE]);
+
+		err = br_mrp_set_port_role(p, role);
+		if (err)
+			return err;
+	}
+
+	if (tb[IFLA_BRIDGE_MRP_RING_STATE]) {
+		struct br_mrp_ring_state *state =
+			nla_data(tb[IFLA_BRIDGE_MRP_RING_STATE]);
+
+		err = br_mrp_set_ring_state(br, state);
+		if (err)
+			return err;
+	}
+
+	if (tb[IFLA_BRIDGE_MRP_RING_ROLE]) {
+		struct br_mrp_ring_role *role =
+			nla_data(tb[IFLA_BRIDGE_MRP_RING_ROLE]);
+
+		err = br_mrp_set_ring_role(br, role);
+		if (err)
+			return err;
+	}
+
+	if (tb[IFLA_BRIDGE_MRP_START_TEST]) {
+		struct br_mrp_start_test *test =
+			nla_data(tb[IFLA_BRIDGE_MRP_START_TEST]);
+
+		err = br_mrp_start_test(br, test);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
 int br_mrp_port_open(struct net_device *dev, u8 loc)
 {
 	struct net_bridge_port *p;